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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,774
    09-30-2005, 09:44 AM Go to last post
  2. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,787
    07-16-2014, 11:01 AM Go to last post
  1. Inference about the difference between two population proportions

    Hi. I've been getting an unusual large z-score on one problem. I keep get a z-score of 12.3. In the question: H0: (P1 - P2) = 0 H1 : (P1 -...

    Started by Emawk‎, 03-22-2006 11:33 PM
    • Replies: 3
    • Views: 3,745
    03-29-2006, 12:34 AM Go to last post
  2. helpz!

    1) a car insurance company has determined that 8% of all ddrivers were involved in a car accident last year. among the 15 drivers living on one...

    Started by HemlyFan‎, 03-29-2006 02:27 AM
    • Replies: 0
    • Views: 4,976
    03-29-2006, 02:27 AM Go to last post
  3. Likert scales and statistics

    I am trying to interpret some results I have from a survey that was used to give an insight into opinions about HR and whether these differences...

    Started by kerry1113‎, 03-28-2006 05:19 PM
    • Replies: 1
    • Views: 3,483
    03-29-2006, 03:03 PM Go to last post
  4. Question Hypothesis Testing

    - Could you let me know is my answer to this problem is correct? My problem with this problem was there was no standard deviation, how do you...

    Started by Ayanna‎, 03-29-2006 01:51 PM
    • Replies: 4
    • Views: 3,179
    03-29-2006, 03:56 PM Go to last post
  5. z score to find ranges

    I am tyring to find the range of salaries earned by the bottom 20% of a group of female educators with the following data: Mean-43.195...

    Started by rgentil32‎, 03-13-2006 08:58 PM
    • Replies: 7
    • Views: 4,246
    03-29-2006, 07:40 PM Go to last post
  6. Question Simple Regression

    Could you tell me what would be my y variable and x variable for this problem? I think advertising cost = y and number of orders = x :confused: ...

    Started by Ayanna‎, 03-30-2006 05:13 PM
    • Replies: 3
    • Views: 3,545
    03-30-2006, 10:49 PM Go to last post
  7. Cool Inference about a Population Mean

    Conditions for inference I understand that the size n of a SRS is important. But I do not understand why. Please explain. I also do not...

    Started by grays‎, 03-30-2006 04:07 PM
    • Replies: 1
    • Views: 3,664
    03-31-2006, 11:12 AM Go to last post
  8. hypothesis testing question

    Of a random sample of 100 families in Richmond, 60 own a house. Is there sufficient evidence at the 0.05 level of significance to conclude that most...

    Started by anthonys‎, 04-01-2006 05:22 PM
    • Replies: 0
    • Views: 2,031
    04-01-2006, 05:22 PM Go to last post
  9. Help With Normal Distribution

    When I am given a problem asking to find the lowest vaule in the top 20% of the test scores i can, but I didnt know if I was doing it right to find...

    Started by chivon101‎, 04-01-2006 05:36 PM
    • Replies: 0
    • Views: 1,860
    04-01-2006, 05:36 PM Go to last post
  10. Question Q about % contribution

    hi, I want to ask: why do we use 'Sum of Squares' in compting percent contribution and not 'effect estimate'??? :confused: thanks for help!!...

    Started by engstudents‎, 04-01-2006 10:40 PM
    • Replies: 1
    • Views: 1,901
    04-02-2006, 10:09 AM Go to last post
  11. Another Hypothesis Question

    OK...pls give me an idea where to start this one...I want to learn the steps, not be given the answer...I'm not looking for charity, just lost in...

    Started by khoops111‎, 03-14-2006 11:51 PM
    • Replies: 2
    • Views: 2,058
    04-02-2006, 10:43 AM Go to last post
  12. Significance level in r (correlation coefficient)

    Hi John: I am going Pearson correlation analyses, first in overall sample, and then I divided them into three strata or groups. r is significant...

    Started by Susanbwh‎, 04-01-2006 10:08 AM
    • Replies: 1
    • Views: 5,282
    04-02-2006, 11:20 AM Go to last post
  13. P-value method

    I have a couple of questions I would like to know if I am doing them correctly or not, any guidence would be greatly appreciated. Test the given...

    Started by hannao1‎, 04-02-2006 10:25 PM
    • Replies: 0
    • Views: 5,934
    04-02-2006, 10:25 PM Go to last post
  14. Normal Distributions

    ok, I have this one problem that I cannot figure out for the life of me. It's probably really simple, but I really just can't figure it out. Any...

    Started by AcidicBassist‎, 04-03-2006 11:35 PM
    • Replies: 0
    • Views: 2,836
    04-03-2006, 11:35 PM Go to last post
  15. Question Can't seem to figure this out... any help?

    "A shopping center developer claims in a presentation to a potential client that at least 40% of the adult female population in a community visit the...

    Started by wbh1‎, 04-04-2006 01:51 PM
    • Replies: 0
    • Views: 2,104
    04-04-2006, 01:51 PM Go to last post
  16. Please check homework problem #2

    :confused: Coaching and the SAT. Suppose that SAT mathematics scores in the absence of coaching vary Normally with mean mule=475 and standard...

    Started by grays‎, 04-04-2006 03:25 PM
    • Replies: 0
    • Views: 4,143
    04-04-2006, 03:25 PM Go to last post
  17. Example Questions for a Final

    Do you have any example questions for a comprehensive final? If, so please e-mail them my final is on May 8, 06. Thanks in advance Shonna

    Started by grays‎, 04-04-2006 03:45 PM
    • Replies: 0
    • Views: 1,982
    04-04-2006, 03:45 PM Go to last post
  18. Question Hypothesis testing for populations?

    I was hoping someone could help me out with the following issue. I am accustomed to performing t-tests on two samples to determine if there is a...

    Started by Christopher‎, 04-05-2006 09:34 AM
    • Replies: 2
    • Views: 2,229
    04-05-2006, 02:06 PM Go to last post
  19. datasets finding

    Hi, my first time on this forum, I will soon do a project on ANOVA and we need to design ANOVA models with 3 factors or more, can anyone provide me...

    Started by hippophip‎, 04-02-2006 09:17 PM
    • Replies: 2
    • Views: 2,195
    04-05-2006, 07:09 PM Go to last post
  20. Newbie Here! Question on find number of test...

    This is a three part question where we are given a set of data samples. coupon tip1 tip2 1 47 ...

    Started by redevo7‎, 04-05-2006 08:57 PM
    • Replies: 1
    • Views: 4,235
    04-05-2006, 10:43 PM Go to last post
  21. Angry Need Help Urgently

    Hey guys I need help in an assignment it is due tonight, and i am clueless about what to do the assignment is here...

    Started by nokidding‎, 04-06-2006 01:39 PM
    • Replies: 0
    • Views: 2,133
    04-06-2006, 01:39 PM Go to last post
  22. Exclamation Post Hoc tests - significant interaction

    I'm involved in a student project that is investigating the effects of anticipation on the magnitude of the reflex muscle activity in the arm. I have...

    Started by CraigMc‎, 04-06-2006 03:11 PM
    • Replies: 0
    • Views: 2,337
    04-06-2006, 03:11 PM Go to last post
  23. Meaning of p

    Hi everyone need a bit of help. From my knowledge the p value is the chance that the null hypothesis is true so if p=0.05 then there is only a 5%...

    Started by borgmeister‎, 04-06-2006 03:40 PM
    • Replies: 1
    • Views: 3,199
    04-06-2006, 07:33 PM Go to last post
  24. Thumbs up Can you check my homework it is due 4/5/06 at 10 a.m. Eastern

    :yup: Holiday Spending. "How much do you plan to spend for gifts this holiday season?" An interviewer asks this question of 250 customers at a...

    Started by grays‎, 04-04-2006 02:59 PM
    • Replies: 2
    • Views: 5,067
    04-07-2006, 10:47 AM Go to last post
  25. simple correlation question

    Dear all, I have a very simple and may be silly question about correlation. When we want to correlate two sets of scores is it necessary that the...

    Started by Humphrey‎, 04-09-2006 05:31 AM
    • Replies: 1
    • Views: 2,143
    04-09-2006, 02:25 PM Go to last post
  26. Red face Can percent be a "continuous" variable?

    I got percentages of lab tests meeting a desirable target range. I want to use the percentages as scores (higher the better) and compare them to...

    Started by kalbright36‎, 04-10-2006 01:52 AM
    • Replies: 1
    • Views: 4,545
    04-10-2006, 07:28 AM Go to last post
  27. Using a TI-84

    Can you show me how to graph a histogram in the calculator:p And how to program the equations that are needed into the calculator for use on the...

    Started by grays‎, 04-04-2006 03:40 PM
    • Replies: 3
    • Views: 4,909
    04-10-2006, 09:53 AM Go to last post
  28. normal distribution questions--am I on the right path

    hi...just checking to see if I am on the right track on these problems. here is what I have: in a normal distribution with u =200 and r=30, find...

    Started by tysull‎, 04-06-2006 08:19 PM
    • Replies: 1
    • Views: 2,377
    04-10-2006, 10:01 AM Go to last post
  29. Hypergeometric distribution question

    I have a homework question on capture/recapture without replacement. I'm really struggling answering the question and hope someone can help. ...

    Started by maggie2‎, 04-08-2006 09:13 PM
    • Replies: 4
    • Views: 4,010
    04-10-2006, 10:15 AM Go to last post
  30. Exclamation Mean and Standard Deviation-due tomorrow

    The amount of time a Lakemore Statistics student spends on homework each evening is approximately normally distributed. If 22% of the 75 students...

    Started by FAIRMADIEN787‎, 04-10-2006 05:28 PM
    • Replies: 1
    • Views: 2,708
    04-10-2006, 11:10 PM Go to last post
  31. Red face survey and "other" responses

    If a survey question offered 2 choices plus "other," when converting to variables, would this be dichotomous or nominal? (The data is not continuous,...

    Started by kalbright36‎, 04-10-2006 05:25 PM
    • Replies: 1
    • Views: 2,217
    04-11-2006, 07:57 AM Go to last post
  32. please help

    ok stats question.... in a recent survey of 500 high school students, 334 said that if they found $1,000 behind a bush at school they would keep the...

    Started by stewartm1‎, 04-11-2006 11:55 AM
    • Replies: 1
    • Views: 1,918
    04-11-2006, 12:08 PM Go to last post
  33. Lightbulb confused again...

    dear friends here i am again. My new query is this: i have one group of patients to be treated in a new position with ESWL: 19 obese patients with...

    Started by tdk‎, 04-01-2006 03:03 PM
    • Replies: 3
    • Views: 1,909
    04-12-2006, 12:57 AM Go to last post
  34. Are weighted means appropriate?

    Hi- I am looking for information about weighted means. Are they appropriate to use when sample sizes are unequal? I am measuring plant roots- some...

    Started by Claire‎, 04-10-2006 03:01 PM
    • Replies: 4
    • Views: 2,764
    04-12-2006, 08:42 AM Go to last post
  35. non parametric stepwise regression

    Anyone know of a nonparametric version for stepwise regression?

    Started by renduff‎, 04-13-2006 06:24 PM
    • Replies: 1
    • Views: 2,903
    04-13-2006, 07:30 PM Go to last post
  36. Likert analysis & survey - help!

    Hi, Pls help. Textbooks on this topic is making me nuts :( I have a 20 qn survey looking at people perceptions on 'perceived unfairness' about an...

    Started by Nina‎, 04-13-2006 09:36 AM
    • Replies: 6
    • Views: 3,332
    04-14-2006, 11:41 AM Go to last post
  37. Arrow level of significance test with no standard deviation

    Hi, one question...been doing one and two tailed tests of level of significance but have a problem without a standard deviation...How do I proceed...

    Started by tysull‎, 04-14-2006 01:51 PM
    • Replies: 1
    • Views: 7,271
    04-14-2006, 02:10 PM Go to last post
  38. Exclamation Construct validity check problems

    Hi, First time user here. Thanks for puttting up this forum! :tup: Background: I am writing about factors that affect the adoption of IT. ...

    Started by holiday‎, 04-14-2006 12:24 AM
    • Replies: 5
    • Views: 3,623
    04-17-2006, 08:18 PM Go to last post
  39. confounded by confounders

    I chose numbers of new patients and numbers of pediatric patients as confounders for a survey of practices used in dialysis facilities. Now that I'm...

    Started by kalbright36‎, 04-14-2006 01:17 AM
    • Replies: 5
    • Views: 2,843
    04-18-2006, 07:51 AM Go to last post
  40. Angry Any suggestions??

    I am working on a project to construct and report results of a regression model, but I am stuck on trying to find an idea to construct. I originally...

    Started by Twinkie‎, 04-18-2006 02:24 AM
    • Replies: 3
    • Views: 2,428
    04-19-2006, 09:59 AM Go to last post
  41. Need help with hypothesis testing problems

    Microsoft believes that if over 30% of Linux users would be interested in a particular new software package, then the company will make at least an...

    Started by securitygeek‎, 04-19-2006 02:36 PM
    • Replies: 0
    • Views: 2,115
    04-19-2006, 02:36 PM Go to last post
  42. How to convert a table of probabilities to j.p.d.f

    Among the sudent that attempted the exams of Calculus III (CIII) and Differential Equation (DE) is oberved that the joint probability of passing or...

    Started by -illuzion-b18c1‎, 04-19-2006 05:08 PM
    • Replies: 0
    • Views: 2,302
    04-19-2006, 05:08 PM Go to last post
  43. Question least regression

    I am a student taking basic stats and I am not sure if I arrived at the correct answer for these could someone please let me know. Consider the...

    Started by momof4‎, 04-19-2006 05:31 PM
    • Replies: 0
    • Views: 1,660
    04-19-2006, 05:31 PM Go to last post
  44. Unhappy What test to use?

    I have a continuous dependent variable and an ordinal variable. I've found tests for 2 ordinal (Kendall's, Gamma), but what do I do in this case?...

    Started by kalbright36‎, 04-20-2006 02:13 AM
    • Replies: 1
    • Views: 2,194
    04-20-2006, 07:35 AM Go to last post
  45. chi square with 0 votes in cells

    Hi! I want to analyze votes for any significant preferencies. My tables look like this: A - 12 B - 8 C- 0 D - 10 Now, the expected frequency is...

    Started by Janka‎, 04-20-2006 11:28 AM
    • Replies: 2
    • Views: 2,798
    04-21-2006, 08:09 AM Go to last post
  46. Sample size and Power

    Hi I am interested in finding out the how to determine what sample size I need for a survey and how that is related to effect and power. Also,...

    Started by Diane‎, 04-17-2006 11:56 AM
    • Replies: 3
    • Views: 2,980
    04-21-2006, 02:33 PM Go to last post
  47. Talking Help

    I need help with answering this question: The average hourly pay of medical typists in a large city if $15.00 with a standard deviation of $2.80....

    Started by GeorgeBurns‎, 04-20-2006 10:10 PM
    • Replies: 1
    • Views: 1,779
    04-22-2006, 11:09 PM Go to last post
  48. Confirmatory factor analysis

    Hi, does anyone here knows a good website that explains how to perform a confirmatory factor analysis with AMOS? Thank you, Hans

    Started by holiday‎, 04-23-2006 03:18 AM
    • Replies: 0
    • Views: 2,490
    04-23-2006, 03:18 AM Go to last post
  49. Smile null and alternate hypotheses

    His agent claims that the average speed of a fastball thrown by pitcher Moe M. Down is 90 mph. If the average speed of 64 randomly selected...

    Started by GeorgeBurns‎, 04-23-2006 12:01 PM
    • Replies: 1
    • Views: 2,184
    04-23-2006, 01:18 PM Go to last post
  50. Smile least-squares prediction

    A sociologist beleives that there is a tendency for tall men to marry tall women. To determine the nature of such a relationship, the heights of the...

    Started by GeorgeBurns‎, 04-23-2006 01:41 PM
    • Replies: 0
    • Views: 2,706
    04-23-2006, 01:41 PM Go to last post
  51. Control Variate for normal r.v.

    Hello! I would like to know what is the best/natural choice for the control variate of a normal (gaussian) random variable. Thank you.

    Started by Bernardokp‎, 04-20-2006 09:15 PM
    • Replies: 2
    • Views: 1,897
    04-23-2006, 05:15 PM Go to last post
  52. Smile Grouping by the dependent variable

    Why should one NOT group by the dependent variable in a regression context?

    Started by callen‎, 04-23-2006 02:54 PM
    • Replies: 1
    • Views: 2,478
    04-23-2006, 07:31 PM Go to last post
  53. Smile Stats help

    Insurance industry analysts report that the average amount of life insurance in effect in Virginia is $92,500 with a sample standard deviation of...

    Started by GeorgeBurns‎, 04-23-2006 01:49 PM
    • Replies: 1
    • Views: 1,589
    04-23-2006, 07:43 PM Go to last post
  54. Cool How do I do this>?

    How do I attempt or solve a question like this? Can someone solve it and expalin it to me as a roadmap to other problems that plague me? here it...

    Started by GeorgeBurns‎, 04-23-2006 04:01 PM
    • Replies: 4
    • Views: 2,282
    04-24-2006, 10:12 AM Go to last post
  55. Arrow Urgent!

    I found this post by Orangeb and its exactly the same quiz Im working on. Could anyone help Orangeb and I on this one? We both would be greatful and...

    Started by GeorgeBurns‎, 04-24-2006 05:46 PM
    • Replies: 1
    • Views: 1,742
    04-24-2006, 06:19 PM Go to last post
  56. Exclamation Statistical analysis for likert type scale

    Hey, please help! I am currently analysing data from a likert scale, descriptive stats not a problem, it is the inferential stats im having a problem...

    Started by mariapsychnightmare‎, 04-23-2006 07:03 PM
    • Replies: 6
    • Views: 16,145
    04-24-2006, 08:27 PM Go to last post
  57. Unspoken ANOVA assumption

    I heard that ANOVA does not like cells with small number of cases and that a small number could throw off results--and that the number is unspeicifed...

    Started by kalbright36‎, 04-22-2006 11:16 PM
    • Replies: 3
    • Views: 2,221
    04-25-2006, 07:52 AM Go to last post
  58. Smile Confidence Interval Help

    A usrvey of 49 randomly selected banks in New York revealed that these banks required average down payments of 35% of the purchase price of the home...

    Started by GeorgeBurns‎, 04-25-2006 07:54 AM
    • Replies: 2
    • Views: 2,619
    04-25-2006, 08:52 AM Go to last post
  59. Question FACTOR ANALYSIS - POOLING data from different samples

    I'm conducting an exploratory factor analysis to examine the factor structure of a translation of an established scale. There are 20 variables. I...

    Started by Binka‎, 04-26-2006 06:14 AM
    • Replies: 0
    • Views: 2,865
    04-26-2006, 06:14 AM Go to last post
  60. Help needed for Analysis on this complex project

    Hello Friends, I have been working on this huge experiment (without a statistical background). It involved 28 participants divided into 4 Groups....

    Started by Ninad‎, 04-26-2006 02:08 PM
    • Replies: 5
    • Views: 2,085
    04-26-2006, 08:22 PM Go to last post

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